Like the Internet, this skeleton is made up of a series of tubes. If you don't like rolling small paper tubes, this may not be a good fit for you. My approach has been a bit loose (measure no times, cut twice) so if you are creating this you will have to play around a little bit and find out what works for you.
The whole thing probably took ~40 hours, but some portion of it was trial and error so you could probably cut it by a decent amount. It was very inexpensive to make, and resulted in a reasonable approximation of what I was looking for.
I am no biologist, nor do I aspire to be. I set out to make something that is only recognizable as a bird's skeleton about the size of a crow. Some of the bones are more faithful reproductions than others, but none of them would be mistaken for the real thing. The crow also ended up with 4 or 5 extra vertebrae because that is how long I wanted the neck to be.